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VFDs and their effect on the power factor of a common AC induction motor

Posted by Brad Steinman on Jan 30, 2020 9:30:00 AM

In a common AC induction motor, a magnetic field is induced in the rotor and the power is supplied directly to the stator. The power used to induce the magnetic field in the rotor is commonly known as reactive power since it does not produce work. The power supplied to the stator is best known as active or real power for it produces the torque of the motor. Together, the real and reactive power form the total or apparent power in the system. This is often depicted on a power triangle.

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Topics: power factor, power quality, VFDs

What is Power Factor Correction?

Posted by James Keys on Jan 14, 2020 8:15:00 AM

Figure 1 - Power Factor Correction Equipment

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Topics: power factor, power factor correction, power capacitors

5 Reasons You Should Be Collecting Production Data Directly from Your Equipment

Posted by Scott Keys on Jan 9, 2020 11:42:16 AM

Industry 4.0 is a term being used a lot in the industrial world right now. It can be applied to anything from batch size 1 machinery to artificial intelligence; essentially technologies we expect to see in a modern-day facility. One of the topics of Industry 4.0 is data collection: How do we get it? Who gets it? What do we do with it?

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Topics: data, orange box, kpi, IoT, Industry4.0

VFD Design: How to connect contactor to motor using safety relays

Posted by Daryl Keys, CET on Dec 27, 2019 8:00:00 AM

In the early days of variable speed drives, Nema rated motor contactors were used. The more economical IEC rated contactor had not be introduced. As variable speed drive technology improved and sequencing the opening of the contactor to coordinate with the termination of current flow to the motor became reliable, the need for a contactor to break an arc took second place to the use of a contactor for isolation purposes. This meant that the more robust and more expensive Nema contactor was not required.

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Topics: VFDs, safety, motorcontactor

What is the ROI of Power Factor Correction?

Posted by James Keys on Dec 20, 2019 8:00:00 AM

What is power factor correction?

Power factor (PF) is a measure of system electrical efficiency. A business that does not manage their PF will likely suffer from financial and operational losses as a result. PF correction is the process of bringing PF closer to 100%, or unity.

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Topics: power factor, ROI

VFD Maintenance: Don't Get Caught With Unformed Capacitors!

Posted by Daryl Keys, CET on Dec 13, 2019 8:00:00 AM

I recently had a situation occur where a customer had a VFD fail and asked me to set up the spare in its place.

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Topics: electrolytic capacitors, VFDs

Industrial Drive Service Cuts Monthly Electricity Bill in Half

Posted by Brad Steinman on Dec 5, 2019 2:01:05 PM

IDS employees regularly repair and perform testing on previously failing drives that are loaned to them from other large industries. Testing is completed through a half hour load test on the drive to determine the effectiveness of the repair. The power factor of the main facility at IDS drops to 0.20 and below during the time of load testing.

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Topics: power factor, power quality

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